Arsenal will be without Kieran Tierney for up to three months after he dislocated his shoulder during their 3-1 win over West Ham on Monday night.
Tierney arrived at the club from Celtic in the summer for a fee of around £25m and has had an injury plagued start to his Premier League career - making just five appearances in the competition so far.
Arsenal's Kieran Tierney will undergo surgery next week after dislocating his shoulder against West Ham on Monday and miss three months of action— Sky Sports News (@SkySportsNews) December 14, 2019
It took the Scotsman until late September to make his Gunners debut due to a hip problem and Tierney's latest injury is likely to keep him out for an extended period of time too.
Sky Sports are reporting that the left-back's current issue is set to keep Tierney out until March. He will have surgery on his shoulder next week before starting a rehabilitation period of around three months.
The 22-year-old missed Arsenal's unconvincing 2-2 draw against Standard Liege on Thursday night and he is also ruled out of the Gunners game against Manchester City on Sunday.
Also ruled out of this weekend's fixture are Granit Xhaka and Hector Bellerin. Xhaka suffered a concussion against the Hammers while Bellerin will be prevented from taking part by a tight hamstring.
One player who is likely available for selection is Nicolas Pepe, who is poised to shake off a bruised knee in time for Sunday's game.
Going into this weekend's fixtures, the Gunners were seven points adrift of the Champions League places and they remain without a manager after the sacking of Unai Emery.
Freddie Ljungberg is currently in interim charge of the team but it is unlikely that he would get the job on a permanent basis.
Brendan Rodgers rebuffed Arsenal's approach - recently signing a new contract with Leicester - and it is said that Manchester City assistant manager Mikel Arteta their top choice for the role.